Performance parameter determination method and device for electrolytic aluminum power supply system, equipment, medium and product

Abstract

The invention discloses a method, a device, equipment, a medium and a product for determining performance parameters of an electrolytic aluminum power supply system, and relates to the technical field of data processing.The method comprises the steps that a preset model building method is used for building an electrolytic aluminum power supply rectification system model of a to-be-detected electrolytic aluminum factory, the similarity between the topological structure of the electrolytic aluminum power supply rectification system model and the actual topological structure of the to-be-detected electrolytic aluminum factory is greater than or equal to a preset matching value; when a performance detection instruction of a to-be-detected electrolytic aluminum factory is received, using a parameter determination device to obtain operating parameters of the electrolytic aluminum power supply rectification system model, the operating parameters including a harmonic parameter and a power factor parameter; and processing the harmonic parameter and the power factor parameter to obtain operation information of the to-be-detected electrolytic aluminum factory, wherein the operation information is used for indicating a parameter adjustment mode of the to-be-detected electrolytic aluminum factory. According to the invention, the electrical characteristics of the electrolytic aluminum factory can be accurately simulated, the accuracy of the obtained parameters is improved, and the difficulty of parameter obtaining work is reduced.

Description

Technical Field

[0001] The present invention relates to the field of data processing technology, and in particular to a method, device, equipment, medium and product for determining performance parameters of an electrolytic aluminum power supply system. Background Art

[0002] Aluminum smelters are high-energy-consuming enterprises. If all electricity is taken from the local power grid, the production cost of aluminum smelters will be relatively high due to the influence of tiered electricity prices. Therefore, the use of new energy and green electricity is an inevitable development trend.

[0003] Photovoltaic, wind power and other new energy sources have the characteristics of strong volatility and randomness. The fluctuation and power electronics of microgrids will lead to a higher proportion of harmonics and a higher amplitude of power factor fluctuations. The rectifier bridge in the electrolytic aluminum power supply rectifier system and the AC / DC conversion link of photovoltaics will also introduce harmonics. The electrolytic aluminum industry requires a stable DC power supply system. Harmonic pollution and low power factor not only affect the work of electrolytic aluminum, reduce the economic efficiency of power transmission, but also affect the operation of the power grid.

[0004] Therefore, how to accurately evaluate the performance parameters such as harmonics and power factor of the electrolytic aluminum power supply rectification system, control the harmonics and power of the electrolytic aluminum power supply rectification system, and enable the electrolytic aluminum plant to use new energy green electricity stably and safely is a problem that needs to be solved urgently. Summary of the invention

[0005] The present invention provides a method, device, equipment, medium and product for determining the performance parameters of an electrolytic aluminum power supply system, which can accurately simulate the electrical characteristics of an electrolytic aluminum plant, improve the accuracy of the acquired parameters, determine the operating information of the electrolytic aluminum plant according to the operating parameters of the electrolytic aluminum power supply rectifier system model, and reduce the difficulty of parameter acquisition.

[0006] According to one aspect of the present invention, a method for determining performance parameters of an electrolytic aluminum power supply system is provided, the method comprising:

[0007] Using a preset model building method, a model of the electrolytic aluminum power supply and rectification system of the electrolytic aluminum plant to be tested is constructed, wherein the similarity between the topological structure of the electrolytic aluminum power supply and rectification system model and the actual topological structure of the electrolytic aluminum plant to be tested is greater than or equal to a preset matching value;

[0008] When receiving a performance test instruction of the aluminum smelter to be tested, the operating parameters of the aluminum smelter power supply rectification system model are obtained by using the parameter determination device, wherein the operating parameters include harmonic parameters and power factor parameters;

[0009] The harmonic parameters and the power factor parameters are processed to obtain the operation information of the aluminum smelter to be detected, wherein the operation information is used to indicate the parameter adjustment method of the aluminum smelter to be detected.

[0010] Optionally, the electrolytic aluminum power supply rectifier system model includes: a DC bus, a load module and at least one operating circuit, the input end of at least one operating circuit is connected to the electric energy equipment, and the output end of at least one operating circuit is connected to the load module through the DC bus; wherein the operating circuit includes a three-phase three-winding on-load tap-changing transformer, a passive filter branch, a rectifier transformer, a saturated reactor and a diode rectifier cabinet, the input end of the three-phase three-winding on-load tap-changing transformer is connected to the electric energy equipment, the output end of the three-phase three-winding on-load tap-changing transformer is respectively connected to the input end of the rectifier transformer and the passive filter branch, the output end of the rectifier transformer is connected to the input end of the saturated reactor, the output end of the saturated reactor is connected to the input end of the diode rectifier cabinet, and the output end of the diode rectifier cabinet is connected to the DC bus.

[0011] Optionally, after building the aluminum electrolytic power supply rectifier system model of the aluminum electrolytic plant to be tested, it also includes: obtaining first current information of the DC bus; determining pulse control information of the saturated inductor based on the first current information, adjusting the operating parameters of the saturated inductor using the pulse control information, and determining whether the first current information meets the transformer adjustment condition, wherein the transformer adjustment condition is that the current value contained in the first current information exceeds a pre-set saturated inductor control range; if the first current information meets the transformer adjustment condition, then determining a gear adjustment scheme of the three-phase three-winding on-load tap-changing transformer based on the current value that meets the transformer adjustment condition, and adjusting the gear of the three-phase three-winding on-load tap-changing transformer using the gear adjustment scheme.

[0012] Optionally, a parameter determination device is used to obtain harmonic parameters of the electrolytic aluminum power supply rectification system model, including: using a harmonic measurement module to obtain second current information at the input end of at least one operating loop; using Fourier transform to parse the second current information to obtain the fundamental current and harmonic current of the electrolytic aluminum power supply rectification system model, wherein the harmonic current includes 5th harmonic current, 7th harmonic current and 11th harmonic current; processing the fundamental current, 5th harmonic current, 7th harmonic current and 11th harmonic current to obtain harmonic parameters.

[0013] Optionally, a parameter determination device is used to obtain power factor parameters of the electrolytic aluminum power supply rectification system model, including: using a power factor measurement module to obtain the three-phase voltage and three-phase current of at least one operating circuit; processing the three-phase voltage and three-phase current to obtain the active power and reactive power of the electrolytic aluminum power supply rectification system model; based on the active power and reactive power, determining the power factor parameter, wherein the power factor parameter P represents active power and Q represents reactive power.

[0014] Optionally, after obtaining the operating information of the aluminum smelter to be tested, it also includes: determining whether there are parameter abnormalities in the operating information, wherein the parameter abnormalities include harmonic abnormalities and power factor abnormalities; if there are harmonic abnormalities in the operating information, generating a harmonic abnormality report based on the harmonic abnormality data in the operating information; if there are power factor abnormalities in the operating information, generating a power factor abnormality report based on the power factor abnormality data in the operating information, wherein the harmonic abnormality report and the power factor abnormality report are used to adjust and / or construct the filtering device and reactive power compensation device of the aluminum smelter.

[0015] According to another aspect of the present invention, a device for determining performance parameters of an electrolytic aluminum power supply system is provided. The device for determining performance parameters of an electrolytic aluminum power supply system is used to implement the method for determining performance parameters of an electrolytic aluminum power supply system in any embodiment of the present invention. The device comprises:

[0016] A model building module, used to build an aluminum electrolytic power supply rectification system model of the aluminum electrolytic plant to be tested by using a preset model building method, wherein the similarity between the topological structure of the aluminum electrolytic power supply rectification system model and the actual topological structure of the aluminum electrolytic plant to be tested is greater than or equal to a preset matching value;

[0017] A parameter determination module is used to obtain the operating parameters of the electrolytic aluminum power supply rectification system model by using the parameter determination device when receiving the performance detection instruction of the electrolytic aluminum plant to be detected, wherein the operating parameters include harmonic parameters and power factor parameters;

[0018] The performance diagnosis module is used to process harmonic parameters and power factor parameters to obtain operation information of the aluminum smelter to be detected, wherein the operation information is used to indicate the parameter adjustment method of the aluminum smelter to be detected.

[0019] According to another aspect of the present invention, there is provided an electronic device, the electronic device comprising:

[0020] at least one processor; and a memory communicatively coupled to the at least one processor;

[0021] Among them, the memory stores a computer program that can be executed by at least one processor, and the computer program is executed by at least one processor so that the at least one processor can execute the method for determining the performance parameters of the electrolytic aluminum power supply system in any embodiment of the present invention.

[0022] According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions, which are used to enable a processor to implement the method for determining performance parameters of an electrolytic aluminum power supply system in any embodiment of the present invention when the computer instructions are executed.

[0023] According to another aspect of the present invention, there is provided a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the method for determining performance parameters of the electrolytic aluminum power supply system of any embodiment of the present invention.

[0024] The performance parameter determination method of the electrolytic aluminum power supply system of the present invention comprises: using a pre-set model construction method to build an electrolytic aluminum power supply rectification system model of the electrolytic aluminum plant to be detected, wherein the similarity between the topological structure of the electrolytic aluminum power supply rectification system model and the actual topological structure of the electrolytic aluminum plant to be detected is greater than or equal to a preset matching value; when receiving a performance detection instruction of the electrolytic aluminum plant to be detected, using a parameter determination device to obtain the operating parameters of the electrolytic aluminum power supply rectification system model, wherein the operating parameters include harmonic parameters and power factor parameters; processing the harmonic parameters and the power factor parameters to obtain the operating information of the electrolytic aluminum plant to be detected, wherein the operating information is used to indicate the parameter adjustment method of the electrolytic aluminum plant to be detected. The technical solution of the present invention, by constructing an electrolytic aluminum power supply rectification system model consistent with the control logic of the electrolytic aluminum plant site, more accurately simulates the electrical characteristics of the power supply rectification system of the electrolytic aluminum plant, improves the accuracy of the acquired parameters, and determines the harmonic parameters and power factor parameters of the electrolytic aluminum plant by measuring the operating information of the electrolytic aluminum power supply rectification system model, thereby reducing the difficulty of parameter acquisition.

[0025] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 It is a flow chart of a method for determining performance parameters of an electrolytic aluminum power supply system provided by the present invention;

[0028] Figure 2 It is a structural schematic diagram of an electrolytic aluminum power supply rectification system model provided by the present invention;

[0029] Figure 3 It is a schematic diagram of the phase shift angle of a positive phase shift transformer provided by the present invention;

[0030] Figure 4 is a schematic diagram of a phase shift angle of a negative phase shift transformer provided by the present invention;

[0031] Figure 5 It is a structural schematic diagram of a harmonic measurement module provided by the present invention;

[0032] Figure 6 It is a structural schematic diagram of a performance parameter determination device for an electrolytic aluminum power supply system provided by the present invention;

[0033] Figure 7 It is a structural schematic diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", "initial", "intermediate", "candidate", "target", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Through green certificate and green electricity trading and the construction of renewable energy power generation projects, electrolytic aluminum enterprises can not only increase the consumption of renewable energy, but also promote the use of clean and low-carbon transportation methods such as closed belt corridors, new energy vehicles and ships, railways, and waterways.

[0037] At present, in the modeling method of phase-shifting transformer, the transformer wiring method is different from the actual situation of the electrolytic aluminum plant. In the simulation model, due to the existence of software simulation errors, the secondary voltage and phase shift angle are also different from the actual situation of the electrolytic aluminum plant. The existing electrolytic aluminum power supply system models are relatively simple and cannot well reflect the topological structure of the electrolytic aluminum system filter. It is impossible to accurately predict the harmonics and power factor before the system is put into operation, and it is impossible to perform corresponding compensation work. In addition, the actual electrolytic aluminum power supply rectifier system uses a phase-shifting transformer to achieve 72-pulse rectification to reduce system harmonics, but the existing model cannot reflect the harmonic control effect of phase-shifting rectification.

[0038] Figure 1 The present invention provides a flow chart of a method for determining performance parameters of an aluminum electrolytic power supply system. This embodiment can be applied to determine accurate harmonic information and power factor information of an aluminum electrolytic plant. The method can be performed by a performance parameter determination device for an aluminum electrolytic power supply system provided by the present invention. The device can be implemented in the form of hardware and / or software. In a specific embodiment, the device can be integrated into an electronic device. The following embodiments will be described by taking the device integrated into an electronic device as an example. Figure 1 , the method specifically comprises the following steps:

[0039] S101. Utilize a pre-set model building method to build a model of the electrolytic aluminum power supply rectification system of the electrolytic aluminum plant to be tested.

[0040] The existing model building method cannot well reflect the topological structures such as the filtering and rectification circuits of the electrolytic aluminum system. The pre-set model building method in the present invention can be understood as a pre-set scheme that can well reflect the topological structure of the electrolytic aluminum system, so as to build a more refined electrolytic aluminum power supply rectification system model whose rectification circuit topology is the same as that of the on-site one. The model built based on this method is the electrolytic aluminum power supply rectification system model described in this embodiment, and the electrolytic aluminum plant to be tested can be understood as an electrolytic aluminum plant with parameter detection requirements. Specifically, the similarity between the topological structure of the electrolytic aluminum power supply rectification system model and the actual topological structure of the electrolytic aluminum plant to be tested is greater than or equal to the preset matching value. The preset matching value can be understood as a similarity judgment parameter set in advance, for example, 99%, 95%, 98%, etc. The similarity between the topological structure of the electrolytic aluminum power supply and rectification system model and the actual topological structure of the electrolytic aluminum plant to be detected is greater than or equal to the preset matching value, which is used to indicate that the topological structure of the electrolytic aluminum power supply and rectification system model constructed by the present invention is highly correlated with the actual topology of the electrolytic aluminum plant, that is, all electrical nodes on site can be mapped into the model for power factor and harmonic measurement, so as to provide a better reference for on-site harmonic and power factor management.

[0041] The constructed model includes multiple phase-shifting rectifier transformers, on-load tap-changing transformers and multiple filter branches. Specifically, the electrolytic aluminum power supply rectifier system model of the present invention may include: a DC bus 9, a load module 3 and at least one operating circuit, the input end of at least one operating circuit is connected to the electric energy equipment 1, and the output end of at least one operating circuit is connected to the load module 3 through the DC bus 9.

[0042] The operating loop can be understood as an operating branch in the system. The system is relatively complex and includes multiple operating branches. Figure 2 The present invention provides a structural schematic diagram of an electrolytic aluminum power supply rectification system model. Figure 2 It can be seen that the operating circuit includes a three-phase three-winding on-load voltage regulating transformer 5, a passive filtering branch 4, a rectifier transformer 6, a saturated reactor 7 and a diode rectifier cabinet 8. The input end of the three-phase three-winding on-load voltage regulating transformer 5 is connected to the electric energy equipment 1, that is, the power grid. The output end of the three-phase three-winding on-load voltage regulating transformer 3 is respectively connected to the input end of the rectifier transformer 6 and the passive filtering branch 4. The output end of the rectifier transformer 6 is connected to the input end of the saturated reactor 7. The output end of the saturated reactor 7 is connected to the input end of the diode rectifier cabinet 8. The output end of the diode rectifier cabinet 8 is connected to the DC bus 9. The DC bus 9 is also connected to the input end 2 of the new energy current.

[0043] Furthermore, after building the aluminum electrolytic power supply rectifier system model of the aluminum electrolytic plant to be tested, the scheme of the present invention also includes: obtaining the first current information of the DC bus; determining the pulse control information of the saturated reactor based on the first current information, adjusting the operating parameters of the saturated reactor using the pulse control information, and determining whether the first current information meets the transformer adjustment condition, wherein the transformer adjustment condition is that the current value contained in the first current information exceeds the pre-set saturated reactor control range; if the first current information meets the transformer adjustment condition, then determining the gear adjustment scheme of the three-phase three-winding on-load voltage-changing transformer based on the current value that meets the transformer adjustment condition, and adjusting the gear of the three-phase three-winding on-load voltage-changing transformer using the gear adjustment scheme. The advantage of such a setting is that the constructed model can be adjusted to make it more in line with the on-site operating conditions, improve the accuracy of the acquired parameters, and better analyze the harmonic conditions and power factor parameter conditions of the system.

[0044] The regulation of the saturated reactor and the on-load transformer is dynamic regulation, and the control of the two is independent of each other. The control range of the saturated reactor is relatively small. Since the regulation target is the current, if it exceeds the regulation range, the bus current will not meet the requirements. At that time, the on-load voltage-changing transformer will find the deviation and then start the regulation work. However, the on-load voltage-changing transformer is regulated one gear at a time, not steplessly. For example, when the current does not meet the requirements, the on-load voltage-changing transformer will act once. If it still does not meet the requirements after the action, it will continue to act until it meets the requirements. Therefore, the on-load voltage-changing transformer can only be roughly adjusted, while the saturated reactor is steplessly regulated and can be finely adjusted. The present invention adopts a coarse adjustment + fine adjustment adjustment method. The saturated reactor will continuously monitor the bus current and perform regulation work before, during and after the on-load voltage-changing transformer acts, and is not affected by the on-load voltage-changing transformer.

[0045] For example, assuming that the saturated reactor adjustment range is 0-70V, but 100V needs to be adjusted, the saturated reactor will adjust to 70V, but the adjustment is still not enough. At this time, it is considered that the current information meets the transformer adjustment conditions, and the on-load tap-changing transformer will act once to adjust the current to the allowable range or the range that the saturated reactor is capable of adjusting, so that the bus current meets the requirements.

[0046] The advantages of the model built by the present invention are as follows: 1) It can determine the harmonics and power factor of the electrolytic aluminum power supply rectification system after connecting to renewable energy sources such as photovoltaics, and can also simulate and test the influence of harmonics and power factors as a reference for subsequent filtering transformation, that is, through this model, the power factor and harmonics of each node can be effectively evaluated, and the design of the filter branch and the configuration of the reactive compensation equipment can be provided in advance, thereby reducing the testing cost. 2) It is highly scalable, and the control system of the model is relatively complete and consistent with the control logic on site. With the widespread application of distributed energy sources such as photovoltaics and wind energy, the power quality problems of each node in the power grid will become more complicated. The simulation model of the present invention can simulate the influence of different power supply schemes on harmonics and power factors, and provide technical support for the coordinated power supply of multiple energy sources for the electrolytic aluminum power supply system. In addition, the electrolytic aluminum plant can use this model to continuously optimize the energy structure, and seamlessly integrate it with renewable energy sources such as photovoltaics and wind energy to reduce overall energy consumption and operating costs. 3) It has high accuracy and can accurately evaluate the influence of power factor and harmonics when different reactive compensation devices and filter systems are deployed at different locations, and the result has a high reference value. 4) It has good adjustability. For example, it can provide a model library for building a phase-shifting transformer so that users can modify the model according to the different on-site structures and parameters of the electrolytic aluminum plant to achieve the purpose of adapting to different simulation objects.

[0047] Based on the electrolytic aluminum power supply rectifier system model, a Simulink control system model can be built. The control logic of the model is: the bus current is used as the input signal of the control system. The signal first outputs an ideal three-phase waveform through a proportional-integral (PI) controller, and then is modulated as a trigger signal of the rectifier bridge through a full name of pulse width (PWM) modulation to adjust the operating parameters of the saturated reactor. For different phase-shifting transformer outputs, the present invention will set different secondary side trigger delays. The control effect of the saturated reactor is achieved by limiting the output thyristor delay angle simulation. When the saturated reactor regulation ability is insufficient and the bus current exceeds the target value, the current is stabilized by adjusting the operating parameters of the on-load tap-changing transformer. Since the model structure of the present invention is perfect and the parameters are consistent with the site, accurate and detailed harmonic and power factor analysis can be performed at any point through Fourier analysis, and any filter branch switching can be realized. The analysis results can be used as a basis for compensation of harmonics and power factors in the electrolytic aluminum power supply system.

[0048] Aiming at the problem that there is no suitable model for the autotransformer with third winding on-load tap-changing transformer in Simulink, the present invention accurately models it by connecting a three-winding transformer model in series and an ideal transformer with variable taps. The modeling is consistent with the transformer parameters and filter branch parameters on site.

[0049] In one embodiment, for the phase-shifting rectifier transformer, the present invention is based on the on-site phase-shifting rectifier transformer structure, adopts the same primary side Z-connection method and secondary side triangle connection method, and sets and fine-tunes the model parameters according to the on-site parameters, so that the error between the secondary side voltage and the on-site secondary side voltage is less than 0.01% (about 0.1V), and the phase shift angle error is less than 0.01°. The advantage of this setting is that the on-site phase-shifting rectifier transformer can be accurately simulated in the model. The internal structure of the constructed rectifier transformer is not shown in this invention. The phase shift angle of the positive phase-shifting transformer is as follows. Figure 3 As shown, the phase shift angle of the negative phase shift transformer is Figure 4 Specifically, Figure 3 is a schematic diagram of a phase shift angle of a positive phase shift transformer provided by the present invention, Figure 4 is a schematic diagram of the phase shift angle of a negative phase shift transformer provided by the present invention, from Figure 3 and Figure 4 It can be seen from the figure that the phase shift angle measured by the model of the present invention is accurate.

[0050] The mathematical model of the three-phase bridge diode rectifier circuit controlled by the saturated reactor in the power supply rectifier system of the present invention is constructed as follows:

[0051] The saturated reactor is equivalent to a thyristor rectifier circuit with nonlinear adjustment of the conduction angle α. Due to the limited adjustment capability of the saturated reactor, when the conduction angle is below 60°, the average output voltage of the three-phase bridge thyristor rectifier current is The saturation angle α of the saturated reactor and the control current I c The relationship is Among them, A t is the cross-sectional area of ​​the saturated reactor core, ω is the grid-side voltage angular frequency, N g is the number of turns of the working winding, N c To control the number of winding turns, B b is the saturation flux density, μ is the core magnetic permeability, I c is the control loop current, E is the effective value of the primary side voltage of the rectifier bridge, I d To consider the average current of the load back electromotive force, U2 is the voltage. The saturation angle of the saturated reactor can be simulated by the conduction angle of the thyristor, and the average voltage output of the rectifier system is Assume that the load back electromotive force is E L , the load resistance is R L Current flowing through the load Considering that the ratio of the on-load tap-changing transformer is k1:k2, the ratio of the rectifier transformer is k3:k4, and the grid voltage E g The relationship between the rectifier primary side voltage E is: Therefore, the grid voltage E g Total load voltage U d , the relationship between the parameters of the saturated reactor is: and Grid voltage E g With load current I L The relationship is Based on the above mathematical calculations, the thyristor rectifier bridge in Simulink can be used as a saturated reactor simulation model.

[0052] S102: upon receiving a performance test instruction of the aluminum electrolytic plant to be tested, using parameter determination equipment to obtain operating parameters of the aluminum electrolytic plant power supply rectification system model.

[0053] Among them, the performance detection instruction can be understood as the parameter evaluation instruction of the electrolytic aluminum plant, which can be triggered by the staff or triggered according to the detection logic. The parameter determination device can be understood as a device set in the model to determine the parameters of each node of the model. The operating parameters can be understood as the operating information of the model, including but not limited to harmonic parameters and power factor parameters. Different parameters require different devices for detection. Therefore, the parameter determination device includes but is not limited to harmonic measurement modules and power factor measurement modules. The advantage of this setting is that the operating parameters of the electrolytic aluminum power supply rectifier system model can be quickly and targetedly obtained.

[0054] Generally speaking, aluminum smelters are most concerned about the 5th, 7th and 11th harmonic currents. Figure 5 It is a structural schematic diagram of a harmonic measurement module provided by the present invention. It can be seen from the figure that the present invention specifically sets up processing components for 5th, 7th and 11th harmonic currents. The triangle in the figure represents the secondary processing component after harmonic processing, the thick line represents signal integration, the arrow represents the flow direction of current information, and the nested rectangle represents the display component of harmonic current information, such as an oscilloscope. Specifically, using parameter determination equipment to obtain harmonic parameters of the electrolytic aluminum power supply rectification system model includes: using the harmonic measurement module to obtain the second current information of the input end of at least one operating loop, the second current information can be understood as the current information of the output end of the electric energy device; using Fourier transform to analyze the second current information to obtain the fundamental current and harmonic current of the electrolytic aluminum power supply rectification system model, wherein the harmonic current includes 5th harmonic current, 7th harmonic current and 11th harmonic current; processing the fundamental current, 5th harmonic current, 7th harmonic current and 11th harmonic current to obtain harmonic parameters.

[0055] Specifically, for the harmonic measurement module, the present invention adopts the medium Fourier analysis method, collects the total current signal (i.e., the second current information), decomposes it into the fundamental current (not shown in the figure) and different harmonic currents through Fourier transform, and focuses on analyzing and processing the 5th, 7th and 11th harmonic currents that the aluminum plant is most concerned about, and outputs the harmonic current curves through Simulink. Since the output current is a peak value, it needs to be converted into an effective value, and the effective value I Peak The conversion between the peak value and the effective value can be achieved by a gain module, which is not limited in this embodiment.

[0056] The use of Fourier analysis to calculate harmonic current has the following advantages: 1) Accurate signal decomposition, that is, Fourier analysis can decompose periodic non-sinusoidal signals into several sine waves (i.e. fundamental and harmonics), accurately analyze the size of different frequency components, and help identify and evaluate the causes and effects of harmonics. Specifically, Fourier analysis can decompose complex time domain signals into a series of frequency components, intuitively see the amplitude and frequency of each harmonic component, facilitate accurate judgment of which specific frequency harmonics have a greater impact, and can more clearly characterize each harmonic component. 2) High frequency resolution, that is, Fourier analysis can accurately calculate the amplitude and phase of each frequency component, which helps to fully understand the performance of harmonics in the power system and assist in specifying accurate harmonic control strategies. 3) Effectively evaluate the impact of harmonics on the system, that is, harmonic currents can cause problems such as heating and power loss. Through Fourier analysis, the specific amplitude of harmonics can be quantified, providing data support for the design, operation and maintenance of equipment, and helping to improve the efficiency and stability of the power system. 4) Simplify the calculation process, that is, Fourier analysis realizes harmonic decomposition through mathematical formulas, simplifies the analysis process of complex signals, and makes harmonic current calculation more intuitive and systematic. 5) It has a wide range of applications, not only suitable for all periodic non-sinusoidal waves, but also can process signals of different frequencies and phases. 6) Fourier analysis can realize real-time harmonic detection through FFT algorithm, which is convenient for automatic control and dynamic adjustment of harmonic governance.

[0057] In another embodiment, a parameter determination device is used to obtain a power factor parameter of an electrolytic aluminum power supply rectification system model, including: using a power factor measurement module to obtain a three-phase voltage and a three-phase current of at least one operating circuit; processing the three-phase voltage and the three-phase current to obtain the active power and the reactive power of the electrolytic aluminum power supply rectification system model; based on the active power and the reactive power, determining the power factor parameter, wherein the power factor parameter P represents active power, and Q represents reactive power. Specifically, VI Measurement in Simulink can be used to accurately collect voltage and current, and the Power Measurement module can be used to calculate the three-phase active power and reactive power, and the power factor can be generated through mathematical operations. This method has the characteristics of fast calculation speed and accuracy, and can make the generated power factor more direct and accurate.

[0058] S103. Process the harmonic parameters and power factor parameters to obtain the operation information of the aluminum smelter to be tested.

[0059] The operation information is used to indicate the parameter adjustment method of the aluminum smelter to be tested. Specifically, the processing of harmonic parameters and power factor parameters can be understood as a comprehensive analysis and evaluation of the harmonic parameters and power factor parameters to determine whether the aluminum smelter has abnormal harmonics or power factor, and then determine the operation information of the aluminum smelter and its diagnosis results, so as to perform parameter compensation.

[0060] After obtaining the operating information of the aluminum smelter to be tested, the present invention also includes: determining whether there is a parameter abnormality in the operating information, wherein the parameter abnormality includes a harmonic abnormality and a power factor abnormality; if there is a harmonic abnormality in the operating information, a harmonic abnormality report is generated based on the harmonic abnormality data in the operating information; if there is a power factor abnormality in the operating information, a power factor abnormality report is generated based on the power factor abnormality data in the operating information, wherein the harmonic abnormality report and the power factor abnormality report are used to adjust and / or construct the filtering device and reactive power compensation device of the aluminum smelter.

[0061] The advantage of this setting is that the detection results can be used to assist the aluminum smelter in the installation and transformation of reactive power compensation devices and filtering devices, thereby improving the system performance of the aluminum smelter.

[0062] This embodiment constructs an aluminum electrolytic power supply rectifier system model that is consistent with the control logic of the aluminum electrolytic plant site, more accurately simulates the electrical characteristics of the power supply rectifier system of the aluminum electrolytic plant, improves the accuracy of the acquired parameters, and determines the harmonic parameters and power factor parameters of the aluminum electrolytic plant by measuring the operating information of the aluminum electrolytic power supply rectifier system model, thereby reducing the difficulty of parameter acquisition. Secondly, a new modeling method for phase-shifting rectifier transformers and on-load tap-changing transformers is proposed to make the transformer model more accurate; a set of sophisticated aluminum electrolytic power supply rectifier system models is also established to facilitate the selection of various electrical nodes for harmonic and power factor acquisition testing, and a power factor and harmonic measurement method based on the Simulink Fourier analysis tool is proposed to accurately evaluate the system harmonic and power factor conditions, and provide data support for the on-site harmonic and power factor management work. Furthermore, the Fourier analysis method is adopted, and the power factor and harmonics of each point can be effectively analyzed, which is convenient for power factor and harmonic testing under different working conditions. Finally, the transformer connection method in the model is consistent with that on site, and the transformer parameters are slightly adjusted based on the nameplate parameters of the on-site rectifier transformer so that the phase shift angle and secondary voltage of the transformer model are consistent with those of the on-site transformer during operation. On this basis, a modeling method for a three-winding autotransformer on-load tap-changing transformer with a filter branch is proposed to realize dynamic adjustment of the on-load switch.

[0063] Figure 6 Schematic diagram of the structure of a device for determining performance parameters of an electrolytic aluminum power supply system provided by the present invention. Figure 6As shown, the device includes: a model building module 201, a parameter determination module 202 and a performance diagnosis module 203.

[0064] The model building module 201 is used to build an aluminum electrolytic power supply and rectification system model of the aluminum electrolytic plant to be tested using a pre-set model building method, wherein the similarity between the topological structure of the aluminum electrolytic power supply and rectification system model and the actual topological structure of the aluminum electrolytic plant to be tested is greater than or equal to a preset matching value.

[0065] The parameter determination module 202 is used to obtain the operating parameters of the electrolytic aluminum power supply rectification system model using the parameter determination device when receiving the performance detection instruction of the electrolytic aluminum plant to be detected, wherein the operating parameters include harmonic parameters and power factor parameters.

[0066] The performance diagnosis module 203 is used to process the harmonic parameters and the power factor parameters to obtain the operation information of the aluminum smelter to be detected, wherein the operation information is used to indicate the parameter adjustment method of the aluminum smelter to be detected.

[0067] Optionally, the electrolytic aluminum power supply rectifier system model includes: a DC bus, a load module and at least one operating circuit, the input end of at least one operating circuit is connected to the electric energy equipment, and the output end of at least one operating circuit is connected to the load module through the DC bus; wherein the operating circuit includes a three-phase three-winding on-load tap-changing transformer, a passive filter branch, a rectifier transformer, a saturated reactor and a diode rectifier cabinet, the input end of the three-phase three-winding on-load tap-changing transformer is connected to the electric energy equipment, the output end of the three-phase three-winding on-load tap-changing transformer is respectively connected to the input end of the rectifier transformer and the passive filter branch, the output end of the rectifier transformer is connected to the input end of the saturated reactor, the output end of the saturated reactor is connected to the input end of the diode rectifier cabinet, and the output end of the diode rectifier cabinet is connected to the DC bus.

[0068] Optionally, the model building module 201 is also used to obtain first current information of the DC bus after building the aluminum electrolytic power supply rectifier system model of the aluminum electrolytic plant to be tested; determine the pulse control information of the saturated inductor based on the first current information, adjust the operating parameters of the saturated inductor using the pulse control information, and determine whether the first current information meets the transformer adjustment condition, wherein the transformer adjustment condition is that the current value contained in the first current information exceeds a pre-set saturated inductor control range; if the first current information meets the transformer adjustment condition, determine the gear adjustment scheme of the three-phase three-winding on-load tap-changing transformer based on the current value that meets the transformer adjustment condition, and use the gear adjustment scheme to adjust the gear of the three-phase three-winding on-load tap-changing transformer.

[0069] Optionally, the parameter determination module 202 is specifically used to use the harmonic measurement module to obtain the second current information of the input end of at least one operating loop; use Fourier transform to parse the second current information to obtain the fundamental current and harmonic current of the electrolytic aluminum power supply rectification system model, wherein the harmonic current includes 5th harmonic current, 7th harmonic current and 11th harmonic current; process the fundamental current, 5th harmonic current, 7th harmonic current and 11th harmonic current to obtain harmonic parameters.

[0070] Optionally, the parameter determination module 202 is specifically used to obtain the three-phase voltage and three-phase current of at least one operating circuit by using the power factor measurement module; process the three-phase voltage and three-phase current to obtain the active power and reactive power of the electrolytic aluminum power supply rectification system model; determine the power factor parameter based on the active power and reactive power, wherein the power factor parameter P represents active power and Q represents reactive power.

[0071] Optionally, the performance diagnosis module 203 is also used to determine whether there are parameter abnormalities in the operating information after obtaining the operating information of the aluminum smelter to be tested, wherein the parameter abnormalities include harmonic abnormalities and power factor abnormalities; if there are harmonic abnormalities in the operating information, a harmonic abnormality report is generated based on the harmonic abnormality data in the operating information; if there are power factor abnormalities in the operating information, a power factor abnormality report is generated based on the power factor abnormality data in the operating information, wherein the harmonic abnormality report and the power factor abnormality report are used to adjust and / or construct the filtering device and reactive power compensation device of the aluminum smelter.

[0072] The performance parameter determination device of the electrolytic aluminum power supply system provided in this embodiment can execute the performance parameter determination method of the electrolytic aluminum power supply system provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0073] Figure 7 : is a schematic diagram of the structure of an electronic device provided by the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0074] like Figure 7As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (also called random access memory, RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, ROM 12 and RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0075] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0076] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a method for determining performance parameters of an electrolytic aluminum power supply system.

[0077] In some embodiments, the performance parameter determination method of the electrolytic aluminum power supply system may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the performance parameter determination method of the electrolytic aluminum power supply system described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the performance parameter determination method of the electrolytic aluminum power supply system in any other appropriate manner (e.g., by means of firmware).

[0078] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0079] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0080] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or equipment. A computer-readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0081] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0082] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server) or a computing system that includes middleware components (e.g., an application server) or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein) or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0083] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0084] In one embodiment, the present invention also includes a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the method for determining the performance parameters of the electrolytic aluminum power supply system of any embodiment of the present invention.

[0085] In the process of implementation, the computer program product can be written in one or more programming languages ​​or a combination thereof to perform the computer program code of the present invention, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0086] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0087] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining performance parameters of an electrolytic aluminum power supply system, characterized in that: include: Using a preset model building method, a model of an aluminum electrolytic power supply and rectification system of the aluminum electrolytic plant to be tested is constructed, wherein the similarity between the topological structure of the aluminum electrolytic power supply and rectification system model and the actual topological structure of the aluminum electrolytic plant to be tested is greater than or equal to a preset matching value; When receiving the performance detection instruction of the aluminum smelter to be detected, using the parameter determination device to obtain the operating parameters of the aluminum smelter power supply rectification system model, wherein the operating parameters include harmonic parameters and power factor parameters; The harmonic parameters and the power factor parameters are processed to obtain the operating information of the aluminum smelter to be detected, wherein the operating information is used to indicate the parameter adjustment method of the aluminum smelter to be detected.

2. The method according to claim 1, characterized in that The electrolytic aluminum power supply rectification system model comprises: a DC bus, a load module and at least one operating circuit, wherein the input end of the at least one operating circuit is connected to the electric energy equipment, and the output end of the at least one operating circuit is connected to the load module through the DC bus; Among them, the operating circuit includes a three-phase three-winding on-load voltage-regulating transformer, a passive filtering branch, a rectifier transformer, a saturated inductor and a diode rectifier cabinet. The input end of the three-phase three-winding on-load voltage-regulating transformer is connected to the electric energy equipment, the output end of the three-phase three-winding on-load voltage-regulating transformer is respectively connected to the input end of the rectifier transformer and the passive filtering branch, the output end of the rectifier transformer is connected to the input end of the saturated inductor, the output end of the saturated inductor is connected to the input end of the diode rectifier cabinet, and the output end of the diode rectifier cabinet is connected to the DC bus.

3. The method according to claim 2, characterized in that After building the electrolytic aluminum power supply rectification system model of the electrolytic aluminum plant to be tested, it also includes: Acquiring first current information of the DC bus; Determine pulse control information of the saturated reactor based on the first current information, adjust operating parameters of the saturated reactor using the pulse control information, and determine whether the first current information meets a transformer adjustment condition, wherein the transformer adjustment condition is that a current value included in the first current information exceeds a preset saturated reactor control range; If the first current information satisfies the transformer adjustment condition, the gear adjustment scheme of the three-phase three-winding on-load tap-changing transformer is determined based on the current value that satisfies the transformer adjustment condition, and the gear adjustment scheme is used to adjust the gear of the three-phase three-winding on-load tap-changing transformer.

4. The method according to claim 2, characterized in that: The method of using the parameter determination device to obtain the harmonic parameters of the electrolytic aluminum power supply rectification system model includes: Using the harmonic measurement module, obtaining second current information of the input end of the at least one operation loop; Analyzing the second current information by Fourier transform to obtain the fundamental current and harmonic current of the electrolytic aluminum power supply rectification system model, wherein the harmonic current includes the 5th harmonic current, the 7th harmonic current and the 11th harmonic current; The fundamental current, the fifth harmonic current, the seventh harmonic current and the eleventh harmonic current are processed to obtain the harmonic parameters.

5. The method according to claim 2, characterized in that: The use of parameter determination equipment to obtain the power factor parameter of the electrolytic aluminum power supply rectification system model includes: Using a power factor measurement module, obtaining the three-phase voltage and three-phase current of the at least one operating circuit; Processing the three-phase voltage and the three-phase current to obtain the active power and reactive power of the electrolytic aluminum power supply rectification system model; Based on the active power and the reactive power, the power factor parameter is determined, wherein the power factor parameter The P represents active power, and the Q represents reactive power.

6. The method according to claim 5, characterized in that After obtaining the operation information of the aluminum smelter to be detected, the method further includes: Determine whether there is a parameter abnormality in the operation information, wherein the parameter abnormality includes a harmonic abnormality and a power factor abnormality; If the operating information contains the harmonic anomaly, generating a harmonic anomaly report based on the harmonic anomaly data in the operating information; If the operating information contains the power factor abnormality, generating a power factor abnormality report based on the power factor abnormality data in the operating information; Among them, the harmonic abnormality report and the power factor abnormality report are used to adjust and / or construct the filtering device and reactive power compensation device of the electrolytic aluminum plant.

7. A device for determining performance parameters of an electrolytic aluminum power supply system, characterized in that: Used to implement the performance parameter determination method of the electrolytic aluminum power supply system as described in any one of claims 1 to 6, the performance parameter determination device of the electrolytic aluminum power supply system comprises: A model building module, used to build an aluminum electrolytic power supply and rectification system model of the aluminum electrolytic plant to be detected by using a preset model building method, wherein the similarity between the topological structure of the aluminum electrolytic power supply and rectification system model and the actual topological structure of the aluminum electrolytic plant to be detected is greater than or equal to a preset matching value; A parameter determination module, configured to obtain the operating parameters of the electrolytic aluminum power supply rectification system model by using a parameter determination device when receiving the performance detection instruction of the electrolytic aluminum plant to be detected, wherein the operating parameters include harmonic parameters and power factor parameters; A performance diagnosis module is used to process the harmonic parameters and the power factor parameters to obtain the operating information of the aluminum smelter to be detected, wherein the operating information is used to indicate the parameter adjustment method of the aluminum smelter to be detected.

8. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively coupled to the at least one processor; Wherein, the memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the performance parameters of the electrolytic aluminum power supply system as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining performance parameters of an electrolytic aluminum power supply system as described in any one of claims 1 to 6 when executed.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the computer program implements the method for determining performance parameters of the electrolytic aluminum power supply system according to any one of claims 1 to 6.

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